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J. Funct. Biomater. 2015, 6(1), 66-76; doi:10.3390/jfb6010066

Cleaning Effectiveness of Three NiTi Rotary Instruments: A Focus on Biomaterial Properties

1
Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Piazzale Golgi 3, 27100 Pavia, Italy
2
Department of Brain and Behavioural Sciences—Section of Statistics, University of Pavia, Via Bassi 21, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Lorenza Petrini
Received: 29 December 2014 / Revised: 26 January 2015 / Accepted: 3 February 2015 / Published: 16 February 2015
(This article belongs to the Special Issue Biomedical Applications of Shape Memory Alloys)
View Full-Text   |   Download PDF [2541 KB, uploaded 16 February 2015]   |  

Abstract

Nickel-titanium (NiTi) instruments are commonly used for shaping the root canal system in endodontic practice. They are more flexible and have better cutting efficiency than conventional stainless steel files. The superelasticity of NiTi rotary files allows the clinicians to produce the desirable tapered root canal form with a reduced tendency to canal transportation and instrument fracture. HyFlex CM instruments are new NiTi rotary instruments with shape memory produced by an innovative methodology (patent pending) that uses a complex heating and cooling treatment that controls the material’s memory. The aim of the present study was to compare the cleaning efficacy of two conventional (Mtwo, Revo-S) Ni-Ti rotary instruments with HyFlex CM. 30 single-rooted freshly extracted teeth were divided into three groups. Root canals were shaped with three NiTi instruments (Mtwo, Revo-S and HyFlex CM) using 5.25% NaOCl and 17% EDTA solutions. Specimens were fractured longitudinally and prepared for SEM analysis at standard magnification of 1000×. The presence/absence of debris smear layer and the presence/absence of smear layer at coronal, middle, and apical third of each canal were evaluated using a 5-step scale for scores. Numeric data were analyzed using Kruskall-Wallis and Mann-Whitney U statistical tests and significance was predetermined at P < 0.05. This study revealed significant differences among the various groups. Despite some minor differences, all instruments removed smear layer and debris produced during instrumentation. HyFlex CM seem to be not so effective in promoting cleanliness of root canal walls and in removing smear layer from dentine if compared to Mtwo and Revo-S. View Full-Text
Keywords: debris; NiTi instruments; SEM; smear layer debris; NiTi instruments; SEM; smear layer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Poggio, C.; Dagna, A.; Chiesa, M.; Beltrami, R.; Bianchi, S. Cleaning Effectiveness of Three NiTi Rotary Instruments: A Focus on Biomaterial Properties. J. Funct. Biomater. 2015, 6, 66-76.

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J. Funct. Biomater. EISSN 2079-4983 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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